int getop(char s[]) {
    if(lp  == lineLength) {
        lineLength = getline(line, MAXLINE);
        lp = 0;
    }
    if(lineLength == 0)
        return EOF;

    char c;
    int i;
  
    while((s[0] = c = line[lp++]) == ' ' || c == '\t')
        ; 
    s[1] = '\0';
    if(!isdigit(c) && c != '.' && c != '-') {
		return c;
    }
	i = 0;
    
	if(c == '-') {
        if(isdigit(line[lp]) || line[lp] == '.') {
			c = line[lp];
		}
        else {
            return c;
        }
    }
	
    if(isdigit(c)) {
        while(isdigit((s[++i] = c = line[lp++])))
            ;
    }
    if(c == '.') {
         while(isdigit((s[++i] = c = line[lp++])))
            ;
    }
	
    lp--;
    return NUMBER;
}